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http://man7.org/linux/man-pages/man2/sendfile.2.html
sendfile() copies data between one file descriptor and another. Because this copying is done within the kernel, sendfile() is more efficient than the combination of read(2) and write(2), which would require transferring data to and from user space.
http://lkml.iu.edu/hypermail/linux/kernel/0301.3/0603.html
1. A kernel with sendfile support (i.e. 2.4.X) 2. A network card capable of doing the TCP checksum in the hardware 3. The application must support sendfile Do you know what applications support zerocopy (sendfile)? I noticed that a zerocopy NFS patch was added to the 2.5.x tree. Does the 2.4.X NFS daemon support zerocopy?
http://www.iris.iris.edu/SystemDocumentation/proftpd/html/howto/Sendfile.html
If your Unix kernel and your filesystems work together to support the use of sendfile(2) properly, you may run into one last potential issue with ProFTPD's ftptop and ftpwho utilities when sendfile(2) is used (at least for versions of proftpd prior to 1.3.4rc1).
https://abitwiser.wordpress.com/2011/02/24/virtualbox-hates-sendfile/
Feb 24, 2011 · Recently, I ran into an issue with Sendfile and Virtualbox’s shared folder support. It seems that the use of Kernel sendfile by either Apache (both debian and centos flavors) or Nginx to serve static files doesn’t work if you update those files at all once they’ve been served.
https://blog.filippo.io/playing-with-kernel-tls-in-linux-4-13-and-go/
Linux 4.13 introduces support for nothing less than... TLS! The 1600 LoC patch allows userspace to pass the kernel the encryption keys for an established connection, making encryption happen transparently inside the kernel. The only ciphersuite supported is AES-128-GCM as per RFC 5288, meaning it only supports TLS version
https://stackoverflow.com/questions/46367130/why-does-apache-recommend-against-using-sendfile-with-nfs-on-linux
Apache recommend against using sendfile() with Linux NFS because their software is popular and triggered many painful to debug sendfile related bugs with older Linux NFS clients. The warning is old and it's probably easier to leave it as-is rather than update it with all the caveats.
https://github.com/dotnet/aspnetcore/issues/18093
For reference, the linux kernel has TLS support (for this purpose) This would require a change in the runtime to support this directly on Socket. The linux APIs are not async; This is another main reason we don't plan to do this. Closing as we don't plan to add this support.
https://reviews.freebsd.org/D21277
Aug 15, 2019 · That I think can wait until we support 1.3. Kernel modules will then be able to use that #ifdef to determine if the kernel itself supports 1.3. We will likely need to make some changes to accommodate 1.3 since the "real" record type isn't in the on-the-wire TLS header for example.
https://www.unix.com/man-page/FreeBSD/2/sendfile/
The number of sendfile() buffers available is determined at boot time by either the kern.ipc.nsfbufs loader.conf(5) variable or the NSFBUFS kernel configuration tunable. The number of sendfile() buffers scales with kern.maxusers.
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